There are three consecutive steps in a customer service process. The first two steps are each ...

There are three consecutive steps in a customer service process. The first two steps are each capable of serving 25 customers per hour while the third step can process only 20 customers per hour.
 
  Which of the following statements regarding this system is TRUE?
  A) The entire system is capable of processing 25 customers per hour.
  B) There are floating bottlenecks in the system.
  C) If the first two steps are run at full capacity, then the third step has a waiting line.
  D) The first and second steps are bottlenecks for the system.